King of Fighters

KOF 2001: Secret Stages and Characters
NOTE: The secret characters are not the hidden strikers.
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Stage of KoreaDefeat 40 or more characters in Party mode.
Stage of JapanDefeat 50 or more characters in Party mode
Stage of ChinaDefeat 60 or more characters in Party mode
Stage of AmericaDefeat 70 or more characters in party mode
Stage of BrazilDefeat 80 or more characters in party mode
Stage of ItalyDefeat 90 or more characters in Party mode
Stage of MexicoDefeat 100 or more characters in Party mode
Stage of Zero and IgnizDefeat 110 characters to use Zero's stage and
defeat 120 characters to use Igniz's stage.
Play as Zero(2001)Defeat 150 characters in Party mode.
Play as IgnizDefeat 200 characters in Party mode.

These strikers are not usable characters,
You should play party mode to unlock the following strikers.
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Striker: Heavy D, Lucky and BrianDefeat 14 characters in party mode
or play 5 hours of game play.
Striker: Blood Iori and Blood leonaDefeat 27 opponents in party
mode.
Striker: Wolfgang Krauser and Mr.BigDefeat 36 opponents in party
mode.
Striker: HiedernDefeat 40 characters in party mode
Striker:Orochi(Blood)Defeat 70 opponents in party mode
Striker: KrizaldDefeat 99 opponents in party mode.

In order to unlock Zero, play through Party Mode unlocking every hidden
Striker in the game. Party Mode will instruct you on how to unlock the
Strikers until you've unlocked them all. Once this is accomplished, you
may select Zero for play in Single and Team Versus or Practice Modes. In
order to select him, choose your character and Striker normally at the
Character Select screen. Once the Order Select screen comes up, select
your primary character with the X button WHILE holding down Up+Square or
Up+Circle (For Player 1 or Player 2 colors respectively). It is easier to,
once you've chosesn your characters at the Character Select screen,
immediately press and hold down Up+Square or Up+Circle before the Order
Select screen comes up, and then, while still holding them down, press X
to select the character at Order Select. If you've done it correctly, a
mechanical noise will sound and Zero's head shot will replace your
character's. You'll be playing as Zero when the round starts!
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Zero in Team/Single Versus & Practice (KOF 2000 only)Unlock all
hidden Strikers in Party Mode. Hold Up+Square or Up+Circle and press
X to select your primary character at the Order Select screen.